JPS5852171B2 - High sensitivity seismic sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration sensor, and particularly to a vibration sensor for high sensitivity.

Conventional seismic sensors include those with a seismic ball mounted on a receiving shaft, but such seismic sensors have high sensitivity (approximately 80
However, in order to achieve this (within 10 gal), the mechanism must be elaborate and the machining and handling must be complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seismic sensor that is easy to work with, can obtain high sensitivity with high precision, and is easy to handle.

For this reason, the high-sensitivity seismic sensor of the present invention includes a receiving shaft erected on a base, and a vibration-sensing column placed on a circular receiving surface at the upper end of the receiving shaft. The present invention is characterized in that a receiving shaft guide having a cone-shaped hole that extends downward and has a circular upper end that fits into the surface is provided at the lower end of the vibration-sensing column.

Further, the high-sensitivity seismic sensor of the present invention is provided with a rotary reset frame that can place the seismic column again on the receiving shaft when the seismic column falls due to an earthquake, and the reset frame is provided with a rotary reset frame that allows the seismic column to be placed on the receiving shaft again. It is characterized by having an oval hole through which it is inserted.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
1 and 2 show a high-sensitivity seismic sensor as a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view thereof, and FIG. It is.

As shown in Figures 1 and 2, a bearing shaft guide 2 is provided at the lower end of the vibration-sensing column 1, and a circular bearing surface at the upper end of the round rod-shaped bearing shaft 3 erected on the base A is provided with a vibration-sensing shaft guide 2. A cylinder 1 is placed upright.

In addition, when the seismic cylinder 1 falls due to an earthquake, it is re-routed to the receiving shaft 3.
A reset frame 4 to be placed thereon is pivotally supported on the wall of the case 6 so as to be rotatable with a knob 5.

Note that the case 6 is formed integrally with the base A and is installed on a required installation surface B.

The reset frame 4 has an oval hole 4a through which the seismic column 1 is inserted.
Bent parts 4b are formed at both ends of this hole, and an arc-shaped receiving part that can securely hold the side surface of the vibration-sensing cylinder 1 when the reset frame 4 is rotated is formed at each bend. Part 4
It is formed inside b.

The bearing shaft guide 2 has an upper end as a circular hole that fits into the circular bearing surface of the bearing shaft 3, and has a cone-shaped hole that opens downward. Any seismic sensitivity can be set by changing the fitting diameter.

Note that the bearing shaft guide 2 may be completely integrated with the seismic column 1, and in that case, a cone-shaped recess is formed in the lower end surface of the seismic column 1.

The seismic cylinder 1 is usually made of metal, and the bearing shaft guide 2 and the bearing shaft 3 are injection molded from a plastic material, so that they can be mass-produced with high precision.

Further, the reset frame 4 can be easily manufactured by metal pressing or bending a wire.

The seismic cylinder 1 is guided by the bearing shaft guide 2 and is placed on the upper surface of the bearing shaft 3.
The center of gravity of the bearing shaft 3 is on the axis of the bearing shaft 3, and the upper surface of the bearing shaft 3 is horizontal.

When the center of gravity of the seismic column 1 moves outside the shaft diameter of the receiving shaft 3 due to external vibration, the seismic column 1 falls over as shown by the dotted line and is held by the reset frame 4.

Next, to return to the shock-sensing position, turn the reset frame 4 in the direction of the arrow to the position shown by the chain line by operating the knob 5.
stand upright.

Note that the reset frame 4 is always kept horizontal so as not to interfere with the seismic sensing action of the seismic column 1.

In this way, according to this seismic sensor, accurate seismic sensitivity can be obtained, and when the seismic column 1 falls, the lower end of the seismic column 1 is moved from the receiving shaft by the bearing shaft guide 2. Since the side portion of the seismic column 1 leans against the reset frame 4 while being engaged with the seismic column 3, there is an advantage that the return operation of the seismic column 1 by the reset frame 4 can be carried out efficiently and quickly.

FIG. 3 shows a high-sensitivity seismic sensor as a second embodiment of the present invention, in which the seismic cylinder 1 and the reset frame 4 are made of electrically conductive members, and the receiving shaft 3 is made of a non-conductive member. When the seismic column 1 falls and comes into contact with the reset frame 4, a lamp 7 and a buzzer 8 are energized via a power source 9 and a cord 10 to issue an alarm.

Further, FIG. 4 shows a high-sensitivity seismic sensor as a third embodiment of the present invention, in which a reed switch 11 is provided on the top plate of the case 6, and a magnet 1 provided on the head of the seismic column 1.
2 moves when the seismic column 1 falls, the reed switch 11 closes and the motor 13 is activated, thereby causing the emergency control device 14 to perform disaster prevention operations.

In FIG. 4, reference numeral 15 indicates a plug that is inserted into the power source.

Furthermore, FIG. 5 shows a high-sensitivity seismic sensor as a fourth embodiment of the present invention, in which a protrusion 16 is provided on the head of the seismic column 1, and a small hole in the top plate of the case 6 is provided with a conversion frame. 17 is inserted through the shaft portion 17a and is swingably supported.

The conversion frame 17 has an annular portion 17b and a displacement detecting portion 17c, which are arranged at the upper and lower ends of the shaft portion 17a and are spaced apart from each other so as to cover the protrusion 16.

Therefore, when the seismic cylinder 1 falls, its protrusion 16 drives the annular portion 17b of the conversion frame 17 and tilts the conversion frame 17 as shown by the dotted line, so that the displacement detection portion 17c detects the displacement d as shown in the figure. begins to occur.

By using this displacement d, it is possible to operate a mechanical control mechanism or the like.

As detailed above, according to the high-sensitivity seismic sensor of the present invention,
An extremely simple configuration in which a bearing shaft guide with a cone-shaped hole that expands downward is provided at one end of the vibration-sensing cylinder, and the vibration-sensing cylinder is placed on the circular receiving surface at the upper end of the bearing shaft through this hole. in,
High seismic sensitivity can be obtained with high precision, and it also has the advantage of being easier to work with than a falling ball seismic sensor.

In addition, in the seismic sensor of the present invention, the reset frame for restoring the fallen seismic cylinder is rotatably provided with an oval hole through which the seismic cylinder is inserted, so that the seismic cylinder is not always in use. This does not impede the action of the cylinder, and has the effect of quickly and reliably returning the vibration-sensing cylinder to the receiving shaft at the time of reset.

[Brief explanation of drawings]

1 and 2 show a high-sensitivity seismic sensor as a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view thereof, and FIG. 3, 4, and 5 are longitudinal sectional views showing high-sensitivity seismic sensors as second, third, and fourth embodiments of the present invention, respectively. 1... Seismic cylinder, 2... Bearing shaft guide,
3... Bearing shaft, 4... Reset frame, 4a
...Oval hole, 4b...Bent part, 5...Knob, 6...Case, 7.
...Lamp, 8...Buzzer, 9...
...Power supply, 10... Code, 11...
Reed switch, 12... Magnet, 13.
...Motor, 14...Emergency control equipment, 1
5...Plug, 16...Protrusion, 17.
... Conversion frame, 17a ... Shaft part, 17b.
...Annular part, 17c...Displacement detection part, A
...Base, B...Installation surface, d...
...Displacement.

Claims (1)

[Claims] 1. A bearing shaft provided with a bearing shaft erected on a base, and a vibration-sensing cylinder placed on a circular bearing surface at the upper end of the bearing shaft, which fits into the circular bearing surface of the bearing shaft. A high-sensitivity seismic sensor, characterized in that a receiving shaft guide having a cone-shaped hole that has a circular upper end and expands downward is provided at the lower end of the seismic cylinder. 2. A bearing shaft is provided with a receiving shaft erected on a base, and an earthquake-sensing column placed on a circular receiving surface at the upper end of the receiving shaft, and has a circular upper end portion that fits with the circular receiving surface of the receiving shaft. A receiving shaft guide having a cone-shaped hole that expands downward is provided at the lower end of the seismic cylinder, and can be placed on the receiving shaft again when the seismic cylinder falls due to an earthquake. A high-sensitivity seismic sensor, characterized in that a rotary reset frame is provided, and an oval hole through which the seismic cylinder is inserted is formed in the reset frame.